I too have had this problem. The limited attempts to fix this on my laptop have made me think that sharing the sound card is more than just making it available to VBox. If I have something using sound when I load VBox then I can't use it. If I start using sound under VL then I loose it in VBox even if it was available. (I have noted similar problems when trying to use the sound resources to edit with Audacity and listen to a CD at the same time.) It seems that exclusive use of my sound card is expected. I'm sure there's a work around for this but I haven't taken the time to look yet.

BTW there's a new VirtualBox out today: 1.5.4.

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The plans of the diligent lead to profit...Pro. 21:5 VL64 7.1 RLU 486143

OK. So there isn't a Vector specific package? I am new to Vector and do not wish to lose control of installed software. Am I best therefore using something like the Fedora rpm and using rpm2tgz so as to retain control of installation with pkgtool? I do note that there is an "All distributions" option but I am not clear on how that works.

Yea, you can go for the all distributions one... that's how I did it, and it works fine.Because it won't show up in gslapt, you can install it in /opt, so that you don't lose track of it... that way, when you want to remove it, it will suffice to remove the Virtual Box directory.

Note that you'll be downloading the binary version, that contains proprietary components. But will give some advantages relative to the open source edition such as better mouse and graphic integration, shared clipboards and folders, and usb support.